Jie Liao, Dong Zhang, Yuefeng Wang, Pengjun Wang, Qiang Fu, Shixun Dai, Weiwei Chen, Lingxiao Ma, Jun Li, T. Dai, Jianyi Yang
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On-chip long-wave infrared gas sensor based on subwavelength grating waveguide
Abstract. A long-wave infrared (LWIR) on-chip gas sensor based on subwavelength grating waveguide is proposed. By optimizing the grating structural parameters, the corresponding slow-light region is overlapped with the absorption spectrum of methane, which can greatly improve the light–gas interaction to achieve excellent sensing performance. The presented waveguide gas sensor is designed to operate at the wavelength of 7.70 μm, which corresponds to the methane absorption peak in the LWIR and exhibits a high slow-light enhancement factor of 7.514. The related sensitivity and limit of detection are, respectively, 26.54393 and 0.1327 ppm.
期刊介绍：
The Journal of Nanophotonics publishes peer-reviewed papers focusing on the fabrication and application of nanostructures that facilitate the generation, propagation, manipulation, and detection of light from the infrared to the ultraviolet regimes.
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